Valve-gear.



Patented Aug. 7, |900. W. M. MUSGRAVE.

VALVE GEAR. I

(Application led Oct. 9, 1899.) (No Model.)-

3 Sheets-Sheet I.

No. 655,569, Patented Aug. 7, |900. W. M. MUSGRAVE.

VALVE GEAR.

(Application led Oct. 9; 1899.)

(No Model.)

No. 655,569. Patented Aug. 7, |900. w. M. MusAvE. VALVE GEAR.

(Application led Oct. A9, 1899.)`

3 Sheets-Sheet 3,'

(No Model.)

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WALTER MARTIN MUSGRAVE, OF BOLTON, ENGLAND.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 655,569, dated August7, 1900.

Application filed October 9, 1899. Serial No. 733,084. (No model.)

To @ZZ whom/ it may concern:

Beit known that I, VALTER MARTIN MUS- GRAVE, of the firm of JohnMusgrave d; Sons, Limited, Bolton, in the county of Lancaster, England,have invented certain newr and useful Improvements in vor Relating toValve- Gear for Corliss and other Motive-Power Engines and in ApparatusTherefor, of which the following is a specification.

This invention refers -to improvements in or relating to valve-gear forOorliss and other motive-power engines and in apparatus therefor; and itconsists in means for allowing of the same being actuated with full oropen steam-ports, say, from nothing to seveneighths of the stroke of theengine by the controlling' action of the governor, between which pointsof the strokeof the engine the cutoff may be effected. This I carry intoeffect by mounting on the Corliss-valve spindles levers to which areprovided adjustable rods, to the other ends of which are attachedtripping rods or bars or their equivalents, extending to the rockinglever, suitably mounted on the side of the cylinder or otherwise, thesaid rocking lever being operated by an eccentric and rod from thecrank-shaft of the engine or other convenient part from which areciprocating motion may be obtained. The adjustable tripping bars orrods or their equivalents are provided with specially-formed surfaces,against which operate bowls or rollers mounted on levers pivoted to aiixing or preparation on the side of the cylinder. The lastmentionedlevers are connected by adjustable or other rods to a lever or leversmounted on a shaft or center actuated by levers and rods coupled in anyconvenient manner to the governor. The lever or levers to which areattached the adjustable or other rods are supported on and operated byamounted sliding rod actuated to and fro by an eccentric and rod or theirequivalents from the crank-shaft or other convenient part of the engine.The usual dash-pots and snift-valves are provided to close thesteam-valves immediately the tripping bars or rods or their equivalentsare released from the rocking lever. The exhaust Corliss valves areoperated independently by means of eccentric and rods from anyconvenient part of the engine.

This invention is equally applicable to what lvare known aswinding-engines for collieries and like purposes and is provided with ahand arrangement for effecting the cut-off from nothing 1o seven-eighthsof the stroke of the engine.

In the drawings, Figure l, Sheet l, is a longitudinal elevation of `myinvention for improvements in or relating to valve-gear for what arewell known as"Corliss engines; Fig. 2, a plan ofFig. l; and Fig. 3,Sheet 2, a longitudinal elevation of my invention for improvements in orrelating to Corliss valvegear for what are well known as windingenginesfor collieries and like purposes, wherein the cut-off is regulated byhand by means of the ordinary reversing-lever in lieu of a governor.

In all the figures the same letters are employed to indicatecorresponding parts.

A is the steam-cylinder of a Corliss engine; B, foundation-plate;@slide-bars; D, steamvalve boxes; E, exhaust-valve boxes; 1F, rockinglever; G, tripping rods or bars; H, eccentric-rod; I, dash-pots, and Jsnift-valves.

In the steam-valve boxes D are located Corliss valves mounted on thevalve-,spindles K, extending through the stufting boxes L to theoutside, the outer ends of the valvespindles K being supported in thebearings M, attached to the valve-box covers N.' On the outer end ofeach valvespindle, K is mounted the lever O, towhich is attached theadjustable rod P by means of the pin Ni; To the other end of eachadjustable rod P is attached the tripping rod or bar G, extending to andover the upper end of the rocking lever F, mounted on the fixing S,attached to the side of the steam-cylinder A, the lixing S being securedthereto by the bolts or set-screws T or their equivalents. The rockinglever F is operated by an eccentric and the rod H from the crank-shaftof the engine or other convenient part from which a reciprocating motionmay be obtained. The end of the eccentric-rod H is attached to therocking lever F by the pin or center WV. .The adjustable tripping rodsor bars G or their equivalents are provided with the speciallyformedsurfaces X, against which operate the bowls or rollers Z, mounted on thelevers a, pivoted by the pins or centers b to the ixing or bracket S',attached to or suspended IOO from the under side of the dash-pot I. Thelevers a are connected by the pins or centers d to the adjustable orother rods c, the other ends of the latter connecting with the levers f,mounted on the loose center g, attached to the sliding rod 71 mounted inthe bearing jon the fixing k, secured to the foundationplate B by thebolts or set-screws Z. On the center g, carrying the compound levers f,is mounted the lever m, which is connected to the lever o by the rod nand pins t, the levers 0 and fr being mounted on the center u in thefixing k. The end of the lever-ris connected to the governor forregulating the speed of the engine by the rod 19. are providedinternally with pistons in the usual manner, being attached to the endsof the rods W', extending through the stuiiingboxes X to the upper endsof the levers o, being secured thereto by the pins or centers Y.

The operation of the mechanism described will be readily understood fromthe description, but may be generally stated as follows: The rockinglever F is operated by the eccentric-rodH from any suitable part of theengine which will impart a reciprocating motion. Said lever, through themedium of the lips formed on its upper end, actuates the adjustable rodsG to open the valves in the boxes D to admit steam to the cylinder. Theends of the adjustable rods are raised out of or lowered into the pathof said lips by 'coming in contact with the rollers Z, the lat-ter beingset to the proper position to be engaged by the recesses X to raise theends of the adjustable rods and release the same by intermediatemechanism controlled by the governor. Vhen the adjustable rods areraised out of the path of the lips of the rocking lever, the valves areclosed by the action of the dash-pots I through the medium of the leversO. The different positions of the rollers Z are imposed by thevariations of the governor, the rollers being moved in the arc of acircle thereby.

In adapting this invention to what are known as winding-engines forcollieries and like purposes the apparatus for connecting the valve-gearto the governor is dispensed with and is substituted by connecting thelever m to the reversing lever or handle q by the rods s y and levers wm', as shown in Fig. 3. The reversing lever or han- The dash-pots I dleq is mounted on the center a2 in the fixing b2. The reversing lever orhandle q is provided with the trigger-lever c', rod d', and slide e',the latter being secured to the side of the lever or handle q bythe clipz. The slide e operates in conjunction with the slots f in the quadrantg toy allow of the Corliss gear being set to any desired position toeiiect the necessary cut-o and for throwing the cut-off gear in and outof action, according to the demands required during the operations ofWindin g up and down the shaft of a colliery or other similar place.

Having now particularly described and ascertained the nature of mysaidinvention and in what manner the same is to be performed,

I declare that what I claim is l. In a valve-gear for steam-enginesprovided with rotary valves, the combination with a rocking lever, oftrip-rods connected to the valves and actuated by said lever, said rodsbeing provided with recesses, of rollers movable in arcs of circles andcooperating with the recesses in the tripping-rods, and intermediatemechanism between said rollers and a, governor for regulating theposition of said rollers, substantially as described.

2. In valvegear for steam-engines provided with rotary valves, thecombination of trip-rods provided with recesses, and means for actuatingsaid rods, of rollers coperating with said trip-rods, and mechanismconnected to said rollers operated bythe governor to regulate theposition of said rollers, substantially as described.

3. In val ve-gear for engines provided with rotary valves, thecombination with trippingrods G provided with recesses X, of levers cb,rollers Z mounted thereon, rods c connected to the levers a., levers fmounted on a center g and connected to the rods c, a sliding rod hconnected to the center g, and mechanism operated by the governorconsisting of lever m, rod n, lever o, r, and rodofor moving the leversf to regulate the position of the rollersZ through the medium of thelevers a, substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wituesses.

WALTER MARTIN MUSGRAVE. [L. s]

Witnesses:

EDMUND CHADWICK, JAS. STEWART BRoADFoo'r.

:seY

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